package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.HttpRequest;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

@Slf4j
//@WebFilter(filterName = "LoginFilter",urlPatterns = "/*")
public class LoginFilter implements Filter {

    //路径匹配器
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        log.info("LoginFilter....");
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //请求路径
        String requestURI = request.getRequestURI();

        //放行路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**"
        };

        //路径匹配结果
        boolean check = check(urls, requestURI);
         if (check){
             //请求路径与要放行的路径相同,
             filterChain.doFilter(request,response);//放行
             return;
         }

        log.info("LoginFilter....");
         //判断是否登录
        if(request.getSession().getAttribute("employee") != null){
            //已登录
            filterChain.doFilter(request,response);//放行
            return;
        }
        //如果未登录,则返回未登录结果,通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
    }

    //路径匹配
    public boolean check(String[] urls,String requestURI ){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match){
                return true;
            }
        }

        return false;
    }
}
